The results of the external Quantum Efficiency (QE) measurements, in the range 150-210 nm, of Poly-, Nano- and Single-Crystalline Diamond (PCD, NCD and SCD) film photocathodes (PCs) are reported and discussed. The diamond films, grown by Microwave Plasma Assisted Chemical Vapour Deposition (MPACVD) technique, have been analyzed with the aim to define which characteristics enhance their QE. It has been found that NCD film PCs, generally showing a lower QE with respect to PCD ones, enhance their photoemission if a graphitic component is present in the film. Surface hydrogenation effects on the photoemissivity of PCs have been investigated. Comparative studies between the QE of an untreated and a hydrogenated-treated diamond film PC show that the hydrogenated sample exhibits Negative Electron Affinity (NEA) properties. An ageing test of 24 h air exposure shows a stability of the hydrogenated diamond PC higher than that of the CsI one. Moreover, the PC conditioning by means of H-2 plasma allows to recover almost completely the loss of PC QE due to ageing effect caused by the air exposure of a previously hydrogenated sample. The sensitivity of PCs depends strongly on the topography of diamond films. (C) 2008 Elsevier B.V. All rights reserved.

Nitti, M., Colasuonno, M., Nappi, E., Valentini, A., Fanizza, E., Benedic, F., et al. (2008). Performance analysis of poly-, nano- and single-crystalline diamond-based photocathodes. In Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (pp.131-135). AMSTERDAM : ELSEVIER SCIENCE BV [10.1016/j.nima.2008.07.062].

Performance analysis of poly-, nano- and single-crystalline diamond-based photocathodes

MILANI, ENRICO;
2008-01-01

Abstract

The results of the external Quantum Efficiency (QE) measurements, in the range 150-210 nm, of Poly-, Nano- and Single-Crystalline Diamond (PCD, NCD and SCD) film photocathodes (PCs) are reported and discussed. The diamond films, grown by Microwave Plasma Assisted Chemical Vapour Deposition (MPACVD) technique, have been analyzed with the aim to define which characteristics enhance their QE. It has been found that NCD film PCs, generally showing a lower QE with respect to PCD ones, enhance their photoemission if a graphitic component is present in the film. Surface hydrogenation effects on the photoemissivity of PCs have been investigated. Comparative studies between the QE of an untreated and a hydrogenated-treated diamond film PC show that the hydrogenated sample exhibits Negative Electron Affinity (NEA) properties. An ageing test of 24 h air exposure shows a stability of the hydrogenated diamond PC higher than that of the CsI one. Moreover, the PC conditioning by means of H-2 plasma allows to recover almost completely the loss of PC QE due to ageing effect caused by the air exposure of a previously hydrogenated sample. The sensitivity of PCs depends strongly on the topography of diamond films. (C) 2008 Elsevier B.V. All rights reserved.
6th International Workshop on Ring Image Cherenkov Counters (RICH 2007)
Trieste, ITALY
OCT 15-20, 2007
Rilevanza internazionale
2008
Settore FIS/01 - FISICA SPERIMENTALE
English
Cathodes; Crude petroleum; Crystalline materials; Diamond cutting tools; Diamonds; Electromagnetic waves; Electron affinity; Field emission cathodes; Hydrogenation; Hydrogenolysis; Ketones; Microcomputers; Microwaves; Photocathodes; Photoelectricity; Plasma deposition; Plasma enhanced chemical vapor deposition; Plasma stability; Testing; Diamond; Microwave Plasma Assisted Chemical Vapour Deposition; Morphology of films; Photoemission; Raman spectra; Diamond films
Intervento a convegno
Nitti, M., Colasuonno, M., Nappi, E., Valentini, A., Fanizza, E., Benedic, F., et al. (2008). Performance analysis of poly-, nano- and single-crystalline diamond-based photocathodes. In Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (pp.131-135). AMSTERDAM : ELSEVIER SCIENCE BV [10.1016/j.nima.2008.07.062].
Nitti, M; Colasuonno, M; Nappi, E; Valentini, A; Fanizza, E; Benedic, F; Cicala, G; Milani, E; Prestopino, G
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/47170
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